Enhancing Quality of Corpus Annotation: Construction of the Multi-Layer Corpus Annotation and Simplified Validation of the Corpus Annotation. - Youngbin Noh; Kuntae Kim; Minho Lee; Cheolhun Heo; Yongbin Jeong; Yoosung Jeong; Younggyun Hahm; Taehwan Oh; Hyonsu Choe; Seokwon Park; Jin-Dong Kim; Key-Sun Choi (PACLIC, 2020)